Question

find angle A , angleB,angleC

Answer 1

Sin(A+B-C)=1/2=sin30

Therefore A+B-C=30

Cos(B+C-A)=1/underroot2=cos45

Therefore B+C-A=45

Adding both the equation

We get B=75/2

And C-A=15/2

A+C=285/2

We get C=150/2

And A=135/2

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